Overview

The modified "E" signal code and modified "O" signal code were in use from
2 September 1945 and 31 March 1952 as a civil ensign for Japanese merchant ships and American merchant
ships respectively.Nozomi Kariyasu, 10 March 2007

Japanese civil ships

by Jaume Ollé

The Treaty of 2 September 1945 established Japanese
independence but under American occupation. The Japanese civil ships had to use
a new ensign based in the letter E of the signal code.Jaume Ollé, 17 January 2000

American ships bound for Japan

by Jaume Ollé

When the ship was American but the destination was Japanese
it had to use a flag based in the letter O of the signal code.Jaume Ollé, 17 January 2000